Strange smell in vents?! - Range Rover Vogue 2014 full size

[cmac16]

I have a Range Rover vogue full size 2014 model and have had an awful smell coming through the vents , best way to describe it as a musty ,dirty old urine smell!!! (It's not very nice) and seems to be coming through the vents and AC particularly noticeable when you turn on the car for the first few seconds.

My dealership say they can't even pick up the smell but had so many people in car smelling it that know its there. Anyone had anything similar? Or can help please?

Thanks

[cmac16]

Thanks for all the advice everyone, it has had a full anti back on the AC system already but didn't make a difference, and hard as my dealership doesnt seem to pick up on the smell even though I think it's really obvious!!

I will definitely ask re the pollen filter fitted though. Any other suggestions would be really appreocated.

Thanks